Serosa or Adventitia
| Section of the human esophagus. Moderately magnified. The section is transverse and from near the middle of the gullet.|
a. Fibrous covering.
b. Divided fibers of longitudinal muscular coat.
c. Transverse muscular fibers.
d. Submucous or areolar layer.
e. Muscularis mucosae.
f. Mucous membrane, with vessels and part of a lymphoid nodule.
g. Stratified epithelial lining.
h. Mucous gland.
i. Gland duct.
m’. Striated muscular fibers cut across.
|Gray's||subject #242 1110|
The mucous membranes (or mucosae or mucosas; singular mucosa) are linings of mostly endodermal origin, covered in epithelium, which are involved in absorption and secretion. They line cavities that are exposed to the external environment and internal organs. They are at several places contiguous with skin: at the nostrils, the lips of the mouth, the eyelids, the ears, the genital area, and the anus. The sticky, thick fluid secreted by the mucous membranes and glands is termed mucus. The term mucous membrane refers to where they are found in the body and not every mucous membrane secretes mucus.
The glans clitoridis and the clitoral hood, as well as the glans penis (the head of the penis) and the inner layer of the foreskin, are all mucous membranes. The urethra is also a mucous membrane. The secreted mucus traps the pathogens in the body, preventing any further activities of diseases.
Some examples of mucosae
- Buccal mucosa
- Esophageal mucosa
- Gastric mucosa
- Intestinal mucosa
- Nasal mucosa
- Olfactory mucosa
- Oral mucosa
- Bronchial mucosa
- Endometrium is the mucosa of the uterus
- Penile mucosa
- eMedicine Dictionary
- Digestive/mammal/system1/system4 - "Mammal, whole system (LM, Low)"
- Medical Subject Headings (MeSH)
|This anatomy article is a stub. You can help World Heritage Encyclopedia by expanding it.|